THE LONG TRAIL: A CHIMERA-LIKE FOSSIL CRUSTACEAN INTERPRETED AS DECAPODA, STOMATOPODA, AMPHIPODA AND FINALLY ISOPODA
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Data
2021-07-01
Autores
Pazinato, Paula G.
Haug, Carolin
Rohn, Rosemarie [UNESP]
Adami-Rodrigues, Karen
Ghilardi, Renato Pirani [UNESP]
Langer, Max Cardoso
Haug, Joachim T.
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Univ Studi Milano
Resumo
The process of interpreting and evaluating a fossil is a difficult task. Isopoda is a species-rich group of peracarid eumalacostracans which represent quite a challenge when found as fossils, independent of whether we are working with fragmentary or more complete specimens. Here we describe a new fossil species of crustacean, Platuropodus odysseus n. gen. n. sp., from the Irati Formation, Permian of Parana Basin, Brazil. After misinterpretations, the fossil taxon is recognised here as a representative of Isopoda. The new species presents characters found in Phreatoicidea, Asellota and Oniscidea in a unique combination for the fossil and extant record, such as two pairs of sub-chelate anterior trunk appendages, a short region after the anus and flat uropods. This chimera-like morphology and a morphometric analysis of the sub-chelae indicate convergent evolution in the early diversification of Isopoda. The morphological diversification present in the Palaeozoic and Mesozoic fossil record of Eumalacostraca indicate a push of the past effect in different ingroups of Peracarida.
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Peracarida, Isopoda, Permian, Parana Basin, morphometric analysis, convergent evolution
Como citar
Rivista Italiana Di Paleontologia E Stratigrafia. Milano: Univ Studi Milano, v. 127, n. 2, p. 211-229, 2021.